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Unknown if towing a trailer,disconnect before test.Check turn signal's on truck alone. If problem continues,check turn signal lamp(s) and socket(s),adjoining connectors wires/pigtails (blown,broken,burnt,corroded).Rapid or no flashing can be result of these defects.Let's look for now your turn signal relay switch as you requested, replace, then retest.F-150's have small fuse panel(about hand size)lower left side of dashboard. F-250's on up,use a flat screwdriver and remove the panel.(Four pastic screw fasteners 1/4 turn counterclockwise)Check for blown fuses.Early model trucks had flasher units (looks like a small can)on the fuse block or very near to it.Some models in the car and truck lines also had signal and/or four-way flashers under the dashboard/instrument panel along the wiring harness sometimes under the dash along the firewall itself. If found, replace,retest. Still problem? then go to beginning on lamp/socket. Also,there is a power distribution panel under the hood.This will be checked later for the trailer problem. (usually on the driver side fenderwell,black box about 2"x 8" in dimension)With fuses/relays.We'll get back to this later. The turn signal lever also has a module built in itself on the steering column. Notice we are starting from the cheapest route then go up. If possible,check wire harness to signals for breaks etc. Repair if needed, then retest.Still problem,replace turn signal switch module. If a trailer is used being the problem,check trailer plug and socket for full installation.Sometimes you have to work the plug to clean the contacts to get good connection due to dirt,corrosion etc.Also socket/pigtail going to harness Clean if needed,replace broken parts. then reinstall and retest. If trailer is encountering lighting/signal problems,truck lights/signals can possibly still operate normally. Trailer power comes from a relay in the power distribution box. Replace relay,retest.Still problem? it's on the trailer.
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